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3 years ago

22)

Chemistry

1 answer:

Setler79 [48]3 years ago

6 0

Answer: A) 4.2 x 10^20

Explanation:

All of the answers are pretty much the same so it comes down to significant digits.

You always go with the <u>least number of significant digits</u> that you have been given.

So 0.24g only has 2 so our answer will only have 2 significant digits.

If you want to know how to do the math here it is:

Avogadro's Number: 6.022 x 10^23

This number also equals 1 mole.

1 mole of sucrose is equal to 342.3g.

So the equation is set up like this:

0.24g x 1 mol / 342.3 g x 6.022 x 10^23 / 1 mol = 4.2 x 10^20 molecules.

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Benzophenone has a normal freezing point of +48.1 oC, with freezing point depression constant Kfpt = − 9.78 oC/m. A 0.1500 molal

Neporo4naja [7]

Answer:

i = 2.79

Explanation:

The excersise talks about the colligative property, freezing point depression.

Formula to calculate the freezing point of a solution is:

Freezing point of pure solvent - Freezing point of solution = m . Kf . i

Let's replace data given. (i = Van't Hoff factor, numbers of ions dissolved in solution)

48.1°C - 44°C = 0.15 m . 9.78°C/m . i

4.1°C / (0.15 m . 9.78°C/m) = i

i = 2.79

In this case, numbers of ions dissolved can decrease the freezing point of a solution, which is always lower than pure solvent.

3 0

3 years ago

PLEASE HELP

charle [14.2K]

Answer: The statement, average kinetic energy of the gas particles is greater in container A because its particles move faster is correct.

Explanation:

Kinetic energy is the energy obtained due to the motion of an object or substance.

$K.E = \frac{3}{2}kT$

where,

T = temperature

This means that kinetic energy is directly proportional to temperature.

So, when heat is provided to container A then its molecules will start to move rapidly from one place to another which will cause more collisions between the atoms.

Hence, average kinetic energy will be more in container A.

Whereas container B is placed at room temperature which is low than that in container A. So, molecules in container B will move at almost same speed and therefore, specific collisions will be there. So, average kinetic energy in container B will be less than that in container A.

Thus, we can conclude that the statement, average kinetic energy of the gas particles is greater in container A because its particles move faster is correct.

8 0

3 years ago

Which fossil fuel is the most abundant in the United States?

lawyer [7]

Answer:

Hello friend :)

Explanation:

Its coal! :D

I had a little joke so yk read it :/

what does the bread wear to sleep?

Jammies

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